[clang] [llvm] [polly] [PassManager] Make passes inherit from RequiredPassInfoMixin/OptionalPassInfoMixin (PR #192120)

[Nikita Popov via cfe-commits]

nikic wrote:

> I'd like to make behavior changes in a followup PR for passes that should be marked required but currently aren't

That's fine.

https://github.com/llvm/llvm-project/pull/192120